The Triangulum Galaxy is sometimes informally known as the “Pinwheel Galaxy” by some amateur astronomy references and in most public outreach web sites. The Triangulum Galaxy can be a spiral galaxy approximately 3 million light-years (ly) from Earth inside the constellation Triangulum. It can be catalogued as Messier thirty three or NGC 598, and is sometimes informally known as the Pinwheel Universe, a nickname this shares with Messier information and facts.